20. Subject to any regulation made under section 69 or 72, the provisions of an agreement shall continue to have effect after its expiry; they shall subsist until the coming into force of a new agreement which may nevertheless contain provisions having effect from the expiry of that which it replaces.
1970, c. 37, s. 16; 1989, c. 50, s. 25; 1991, c. 42, s. 567.